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/*
 * Copyright (c) 2009-2016, Data Geekery GmbH (http://www.datageekery.com)
 * All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Other licenses:
 * -----------------------------------------------------------------------------
 * Commercial licenses for this work are available. These replace the above
 * ASL 2.0 and offer limited warranties, support, maintenance, and commercial
 * database integrations.
 *
 * For more information, please visit: http://www.jooq.org/licenses
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 */

package org.jooq.impl;

import static org.jooq.Clause.CONDITION;
import static org.jooq.Clause.CONDITION_EXISTS;
import static org.jooq.Clause.CONDITION_NOT_EXISTS;

import org.jooq.Clause;
import org.jooq.Context;
import org.jooq.Select;

/**
 * @author Lukas Eder
 */
final class ExistsCondition extends AbstractCondition {

    private static final long     serialVersionUID   = 5678338161136603292L;
    private static final Clause[] CLAUSES_EXISTS     = { CONDITION, CONDITION_EXISTS };
    private static final Clause[] CLAUSES_EXISTS_NOT = { CONDITION, CONDITION_NOT_EXISTS };

    private final Select       query;
    private final boolean         exists;

    ExistsCondition(Select query, boolean exists) {
        this.query = query;
        this.exists = exists;
    }

    @Override
    public final void accept(Context ctx) {
        boolean subquery = ctx.subquery();

        ctx.keyword(exists ? "exists" : "not exists")
           .sql(" (")
           .subquery(true)
           .formatIndentStart()
           .formatNewLine()
           .visit(query)
           .formatIndentEnd()
           .formatNewLine()
           .subquery(subquery)
           .sql(')');
    }

    @Override
    public final Clause[] clauses(Context ctx) {
        return exists ? CLAUSES_EXISTS : CLAUSES_EXISTS_NOT;
    }
}